GR bi FS Denver, Colorado. Ames, Mr. John Browning, «Me. & M45. Browning Osden, Dear Okla. ,Sept.9- Company, Utah, Mr, Browning: your lette * the third. The original Super Fox was overbored to a barrel diam of 4750. Choke length wa es inchs a straight taper, with constriction of 50/1000 LC. This boring was designed by sweeley, Twin Falls , idaho. The chamber tapered from ,.800" a(9Q", «. Later 11 was discovered that .790 was too ticht for shells, and it was widened to .793. Cone was 3/4 inch, tapering from the chamber diameter to the barrel diameter, straight taper. The chambers were three inch, same as the cases. Later, after a good deal of experimental work, it was dis covered that barrels over bored to .740 instead of .750 shot just as well. I think the Fox people changed to the .740 boring, at least I four with advised it. Such and a half inches a constriction of suns were bored evenly .740 from cone to from the muzzle, then tapered, straight taper, 46/1000 at the muzzle. Occasionally, where a cun was not found to°* be shooting close enough, the barrel was opened up back of the choke, enlarged about two or three thousandths of an inch, in a length of an inch and a half with the polishing tool, taper ing was 2 in to the center of the seme as bef fore, 7/8 inches long, cone anh eighth does the i¢ Or ct j go of again. 3" case permitted extend which an thing, Fox this enlargement and out except the chamber for a I. .750.cun no inch/ This I. thi ink, do not works need of the was put shell found whether to Chambering was cut up into to improve patterns, they reached like the dette: conclu know, well, an over Yours, normal bore velocity of more and than no loss 10/1000 of inch.